How the BIT_AND() function works in Mariadb?

The BIT_AND() function is an aggregate function that returns the bitwise AND of all values in a given expression.

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The BIT_AND() function is an aggregate function that returns the bitwise AND of all values in a given expression. The BIT_AND() function can be used to perform bitwise operations on a set of values, such as a column, a group, or a table. For example, the BIT_AND() function can be used to get the bitwise AND of all values in a column.

Syntax

The syntax of the BIT_AND() function is as follows:

BIT_AND(expression)

The expression parameter can be any valid numeric expression, such as a column name, a literal value, or a function call. The expression parameter is the expression that you want to get the bitwise AND of. The expression parameter cannot be NULL.

The BIT_AND() function returns a numeric value, which is the bitwise AND of the input expression. If the input expression is NULL or contains no values, the BIT_AND() function returns NULL.

Examples

Here are some examples of using the BIT_AND() function in Mariadb:

Example 1: Bitwise AND of a literal expression

To get the bitwise AND of a literal expression, you can simply pass the expression as the parameter. For example:

SELECT BIT_AND(1 + 2 + 3 + 4 + 5) AS result;

This statement returns 0 as the output, which is the bitwise AND of the expression 1 + 2 + 3 + 4 + 5.

Example 2: Bitwise AND of a column

To get the bitwise AND of a column, you can use the column name as the parameter. For example, suppose you have a table called numbers that stores a single column of numeric values. You can use the BIT_AND() function to get the bitwise AND of all values in the column. For example:

SELECT BIT_AND(value) AS result
FROM numbers;

This statement returns the bitwise AND of all values in the numbers table. For example, if the table contains the following data:

value
1
2
3
4
5

The statement returns 0 as the output, which is the bitwise AND of all values in the column.

Example 3: Bitwise AND of a group

To get the bitwise AND of a group, you can use the BIT_AND() function with the GROUP BY clause. For example, suppose you have a table called sales that stores the date, the product, and the quantity of each sale. You can use the BIT_AND() function with the GROUP BY clause to get the bitwise AND of the quantity of each product sold in each month. For example:

SELECT DATE_FORMAT(date, '%Y-%m') AS month, product, BIT_AND(quantity) AS result
FROM sales
GROUP BY month, product;

This statement returns the month, the product, and the bitwise AND of the quantity for each group in the sales table. For example, if the table contains the following data:

date product quantity
2023-01-01 Apple 10
2023-01-02 Banana 20
2023-01-03 Cherry 30
2023-01-04 Durian 40
2023-01-05 Eggplant 50
2023-02-01 Apple 15
2023-02-02 Banana 25
2023-02-03 Cherry 35
2023-02-04 Durian 45
2023-02-05 Eggplant 55

The statement returns the following output:

month product result
2023-01 Apple 0
2023-01 Banana 0
2023-01 Cherry 0
2023-01 Durian 0
2023-01 Eggplant 0
2023-02 Apple 1
2023-02 Banana 1
2023-02 Cherry 1
2023-02 Durian 1
2023-02 Eggplant 1

Example 4: Bitwise AND of a table

To get the bitwise AND of a table, you can use the BIT_AND() function with the * symbol. For example, suppose you have a table called numbers that stores a single column of numeric values. You can use the BIT_AND() function with the * symbol to get the bitwise AND of all values in the table. For example:

SELECT BIT_AND(*) AS result
FROM numbers;

This statement returns the bitwise AND of all values in the numbers table. For example, if the table contains the following data:

value
1
2
3
4
5

The statement returns 0 as the output, which is the bitwise AND of all values in the table.

Example 5: Bitwise AND of a NULL value

To get the bitwise AND of a NULL value, you can use the NULL value as the parameter. However, the BIT_AND() function will return NULL as the output, because the input value is NULL. For example:

SELECT BIT_AND(NULL) AS result;

This statement returns NULL as the output, because the input value is NULL.

Some of the functions that are related to the BIT_AND() function are:

  • The BIT_OR() function, which returns the bitwise OR of all values in a given expression. The BIT_OR() function can be used to perform bitwise operations on a set of values, such as a column, a group, or a table. For example, the BIT_OR() function can be used to get the bitwise OR of all values in a column.
  • The BIT_XOR() function, which returns the bitwise XOR of all values in a given expression. The BIT_XOR() function can be used to perform bitwise operations on a set of values, such as a column, a group, or a table. For example, the BIT_XOR() function can be used to get the bitwise XOR of all values in a column.
  • The BIT_COUNT() function, which returns the number of bits that are set in a given expression. The BIT_COUNT() function can be used to count the number of bits that are 1 in a binary value, such as a column, a group, or a table. For example, the BIT_COUNT() function can be used to count the number of bits that are 1 in a column.

Conclusion

The BIT_AND() function is a useful function that can help you get the bitwise AND of all values in a given expression in Mariadb. You can use it with any valid numeric expression, such as a column name, a literal value, or a function call. The BIT_AND() function returns a numeric value, which is the bitwise AND of the input expression. You can also use some other functions that are related to the BIT_AND() function, such as the BIT_OR(), BIT_XOR(), and BIT_COUNT() functions.